The number of days available for bank renewal of the accounts receivable securitization facility.

No definition available.

Name:	cbb_AccountsReceivableFacilityRenewalTerm
Namespace Prefix:	cbb_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of borrowings outstanding on the accounts receivable securitization facility as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	cbb_ReceivablesFacilityAmountOutstanding
Namespace Prefix:	cbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The maximum borrowing availability under the accounts receivable securitization facility as of the balance sheet date, based on the quantity and quality of outstanding accounts receivable.

+ References

No definition available.

+ Details

Name:	cbb_ReceivablesFacilityMaximumBorrowingAvailability
Namespace Prefix:	cbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity of the accounts receivable securitization facility based on the terms of the agreement.

+ References

No definition available.

+ Details

Name:	cbb_ReceivablesFacilityMaximumBorrowingCapacity
Namespace Prefix:	cbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The remaining borrowing availability under the accounts receivable securitization facility as of the balance sheet date (after subtracting outstanding letters of credit), based on the quantity and quality of outstanding accounts receivable.

+ References

No definition available.

+ Details

Name:	cbb_ReceivablesFacilityRemainingBorrowingCapacity
Namespace Prefix:	cbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Debt Debt - Credit Facility (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Jan. 24, 2013 Line of Credit [Member] CyrusOne LP [Member]
Line of Credit Facility [Line Items]
CyrusOne Credit Agreement				$ 225
Receivables facility maximum borrowing capacity	120.0	105.0
Receivables facility amount outstanding	0		52.0
Letters of Credit Outstanding, Amount	5.2
Receivables Facility Remaining Borrowing Capacity	102.7
Receivables facility maximum borrowing availability	$ 107.9
Accounts Receivable Facility, Renewal Term	364